title: Routine supplementation does not warrant the nutritional status of vitamin d adequate after gastric bypass Roux-en-Y.
abstract: Bariatric surgery can lead to nutritional deficiencies, including those related to bone loss. The aim of this study was to evaluate serum concentrations of calcium, vitamin D and PTH in obese adults before and six months after gastric bypass surgery in Roux-en-Y (RYGB) and evaluate the doses of calcium and vitamin D supplementation after surgery.
  
  
  METHODS
  Retrospective longitudinal study of adult patients of both sexes undergoing RYGB. We obtained data on weight, height, BMI and serum concentrations of 25-hydroxyvitamin D, ionized calcium and PTH. Following surgery, patients received dietary supplementation daily 500 mg calcium carbonate and 400 IU vitamin D.
  
  
  RESULTS
  We studied 56 women and 27 men. Preoperative serum concentrations of vitamin D were inadequate in 45% of women and 37% of men, while in the postoperative period 91% of women and 85% of men had deficiency of this vitamin. No change in serum calcium was found before and after surgery. Serum PTH preoperatively remained adequate in 89% of individuals of both sexes. After surgery serum concentrations remained adequate and 89% women and 83% men evaluated.
  
  
  CONCLUSIONS
  Obesity appears to be a risk factor for the development of vitamin D. The results show that supplementation routine postoperative was unable to treat and prevent vitamin D deficiency in obese adults undergoing RYGB.
authors.affiliation: Center for Research on Micronutrients Institute of Nutrition Josué de Castro, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. cintialeticia2005@yahoo.com.br
authors.forename: Cintia Leticia
authors.initials: CL
authors.lastname: da Rosa
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Dames Olivieri Saubermann
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Jacqueline
authors.forename: Silvia Elaine
authors.initials: SE
authors.lastname: Pereira
authors.forename: Carlos
authors.initials: C
authors.lastname: Saboya
authors.forename: Andréa
authors.initials: A
authors.lastname: Ramalho
mesh_terms: D000328:Adult; D000713:Anastomosis, Roux-en-Y; D000886:Anthropometry; D015992:Body Mass Index; D002118:Calcium / Q000097:blood; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009752:Nutritional Status; D009765:Obesity / Q000601:surgery / Q000628:therapy; D010281:Parathyroid Hormone / Q000097:blood; D012189:Retrospective Studies; D012727:Sex Characteristics; D014807:Vitamin D / Q000378:metabolism*; D014808:Vitamin D Deficiency / Q000188:drug therapy* / Q000209:etiology*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; D002118:Calcium